I just read through the Disc in Use section and it doesn't cover the question at all. Only possible technical out would be the "unique marking". If you use someone else's disc it has their unique marking, not yours...but its a pretty weak argument. I didn't know you were actually obligated to mark your disc

F. All discs used in play, except mini marker discs, must be uniquely marked in ink or pigment-based marking which has no detectable thickness. A player shall receive a warning for the first instance of throwing an unmarked disc if observed by two or more players of the group or an official. After the warning has been given, each subsequent throw by the player with an unmarked disc shall incur one penalty throw if observed by two or more players of the group or an official.

Which is one more stroke added to the one you just threw.

I played with a guy who just put 3 dots on his disc. It's just like in white-ball.

The disc is still uniquely marked, just not with your name. This is unlike ball golf where you are only allowed up to 14 clubs inyour bag. You break one there's no replacing it, you finish the round with 13._________________If you can't win the event in regulation, try, try, try again.

If you are cruising by the parking lot, could you stop at the car in the middle of a round and reload your bag? i think you can, in which case another player could give you discs from their bag as well....still not sure about this.

The technical issue could be that you are throwing a disc with someone else's unique mark....which makes it not unique once you throw his disc....resulting in penalty strokes for both players lol.

If you are cruising by the parking lot, could you stop at the car in the middle of a round and reload your bag? i think you can, in which case another player could give you discs from their bag as well....still not sure about this.

The technical issue could be that you are throwing a disc with someone else's unique mark....which makes it not unique once you throw his disc....resulting in penalty strokes for both players lol.

As long as you don't take too long you certainly can go to your car. Players stop to pee. To get a drink. Etc.

If this does come up, and some d!ck, and his buddy (cause you need two to make the call) give you the first warning you just ask permission from the nice guy who lent you the disc to add a dot with a sharpie to "unique" it up.

Asked:
Another question (or three). I've re-read the rules, and there's nothing stopping me from borrowing a disc from another player to continue my destruction of my rating on one hole. Would you agree? Would I have to put another marking to make it "unique"? If the course meanders close to my car, could I restock on discs in the middle of a round?

Response:
Geoff,
Those are all fine (within the 30-second window of course).
-Conrad